PB145 High Voltage Dead Tank Circuit Breakers
Reliable High-Voltage Breakers
The PB145 Family of High-Voltage Dead-Tank Circuit Breakers (123–170 kV) from Pennsylvania Switchgear offers high performance, reliability, and easy maintenance through advanced interrupter technology, internal tank heating, and an integral particle trap design. These breakers exceed ANSI standards with superior short-circuit capability, fast interruption, and customizable features for diverse installation environments.
- Rated for 123–170 kV, 40 kA short-circuit, and BIL up to 750 kV.
- Integral particle trap and internal SF₆ tank heater enhance dielectric reliability and simplify maintenance.
- Built-in lube fittings and accessible auxiliary switches enable quick servicing without special tools.
- Standard features: composite insulators, galvanized frame, stainless-steel hardware, NEMA 3R cabinet.
- Optional features: porcelain or high-altitude insulators, NEMA 4X cabinet, and enhanced seismic performance.
- Operates from −55 °C to +50 °C, up to 3,300 ft altitude.
Pennsylvania Switchgear engineers design advanced high-voltage circuit breakers using powerful tools such as CFD, FEA, and 3D CAD to achieve exceptional performance, reliability, and operating speed. The PB145 breaker family exemplifies this expertise, featuring advanced spring and interrupter technology tested to L30 line fault duties, a 1.5 first-pole-to-clear factor at 170 kV, a high asymmetry ratio of 33, and superior short-time current test results exceeding standards. Designed and built in the U.S. by specialists dedicated to circuit breaker innovation, the PB145 also offers simplified maintenance with accessible lube fittings, hand-charging capability, and integrated auxiliary switches for ease of service.
The PA Switchgear HV Circuit Breaker Advantage
Tank Cross Section
Design Features
Integral Particle Trap: Improved dielectric performance is achieved through the patented particle trap design, integral to each interrupter’s enclosure. The trap ensures that any particles or arc by-products generated during breaker operations are electrically shielded at the enclosure’s lowest point.
Integral Particle Trap/Tank Heater
Tank Cross Section
Specialized Heater Element: Unlike conventional external heaters, Pennsylvania Switchgear heaters are installed inside the tank to directly heat the SF6 gas. The heater element can be replaced within minutes without opening the tank or removing the SF6 gas.
- Integral particle trap
- Composite insulators
- Galvanized support frame
- Powder-coated NEMA 3R control cabinet
- Stainless steel door handles
- Stainless steel SF6 tubing
- Ganged SF6 monitoring
- SAE hardware
- Fully assembled shipments
- Low-temperature performance to -55˚C
- ASME Pressure Vessel Certification
- Internal tank heater
- Porcelain insulators
- Extra-high creep/high-altitude insulators
- High seismic performance
- Individually-phased SF6 monitoring
- NEMA four-hole universal positioning terminals
- NEMA 4X mechanism/control cabinet
- Custom control package
- Extra auxiliary contacts
- Custom support structure
- Side-mounted position indicator for long-distance viewing
PB145 Circuit Breaker Specifications
| Inches | A | B | C | D | E | F | G | H | J | K | L | M | N | O | P |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PB123-40 | 138 | 74 | 71 | 71 | 58 | 153 | 115 | 82 | 68 | 48 | 22 | 181 | 84 | 58 | 41 |
| PB145-40 | 138 | 74 | 71 | 71 | 58 | 153 | 115 | 82 | 68 | 48 | 22 | 181 | 84 | 58 | 41 |
| PB170-40 | 143 | 77 | 74 | 74 | 62 | 158 | 115 | 85 | 72 | 56 | 22 | 188 | 84 | 58 | 41 |
| Rating | PB123-40 | PB145-40 | PB170-40 |
|---|---|---|---|
| Standards | ANSI/IEEE | ANSI/IEEE | ANSI/IEEE |
| Maximum Voltage | 123 kV | 145 kV | 170 kV |
| BIL | 550 kV | 650 kV | 750 kV |
| Frequency | 60 Hz | 60 Hz | 60 Hz |
| 60 Hz Withstand | 260 kV | 310 kV | 365 kV |
| Short-Circuit Current | 40 kA | 40 kA | 40 kA |
| Continuous Current | 2 kA / 3 kA / 4 kA | 2 kA / 3 kA / 4 kA | 2 kA / 3 kA / 4 kA |
| Interrupting Time | 3 cycles | 3 cycles | 3 cycles |
| Duty Cycle | O-0.3s-CO-15s-CO | O-0.3s-CO-15s-CO | O-0.3s-CO-15s-CO |
| Temperature | -55°C to +50°C | -55°C to +50°C | -55°C to +50°C |
| Altitude Above Sea Level | up to 3,300 ft | up to 3,300 ft | up to 3,300 ft |
| Seismic (IEEE 693-2005) | High | High | High |
| Normal Operating Pressure | 90 psig @ 20°C | 90 psig @ 20°C | 90 psig @ 20°C |
| Minimum Pressure to Interrupt Fault Current | 76 psig @ 20°C | 76 psig @ 20°C | 76 psig @ 20°C |
| Minimum Pressure to Interrupt Load Current | 76 psig @ 20°C | 76 psig @ 20°C | 76 psig @ 20°C |
Manufacturing Facility in Canonsburg, PA
